Projection apparatus for motion pictures



, vvulbH HUUIH v v v v May 17, 1932- J. BURKHARDT 1,359,023

PROJECTION APPARATUS FOR MOTION PICTURES Filed Dec. 18, 1929 2SheetsSheet 1 IN VENT OR ATTO S May 17, 1932.

J. BURKHARDT PROJECTION APPARATUS FOR MOTION PICTURES Filed Dec.

18. 1929 2 Sheets-Sheet 2 INVENTOR Patented May 17, 1932 UNITED STATESvuou mi iZ-JUiii JAKOB BURKHARDT, OF DETROIT, MICHIGAN, ASSIGNOR TOTHIRD DIMENSION PICTURES, INQ, OF NEW YORK, N. Y.

PROJECTION APPARATUS FOR MOTION PICTURES Application filed December 18,1929.

My improved projecting apparatus is especially designed for theprojection of motion pictures resulting in stereoptican or reliefeffects, the machine illustrated being designed for projecting a filmsuch as shown in my application for Letters Patent Serial No.357,1 16filed April 22. 1929, in which associated pairs of foreground andbackground pictures are arranged in side by side relation on the film,the pictures being in miniature and the background ure having a mask ofthe for mmfi icture thereon.

The main objects of this invention are:

First, to provide a lens apparatus for projecting such a film with thepaired foreground and background pictures in proper superimposedrelation and in upright relation on the film.

Second, to provide an apparatus of this character which may beaccurately adjusted to register the pairs of pictures.

Third, to provide a lens box unit adapted for the purpose aboveindicated which may be employed on standard types of pro ectingmachines, or types now extensively used.

Objects pertaining to details and economies of my invention willdefinitely appear from the description to follow. The invention isdefined in the claims.

A structure which embodies the features of my invention is clearlyillustrated in the accompanying drawings, in which:

Fig. 1 is a plan view of a lens box unit embodying the features of myinvention, a fragment only of the projecting machine being illustrated.

Fig. 2 is a fragmentary view partially in section on line 2-2 of Fig. 1.

Fig. 3 is a detail view mainly in longitudinal section on line 33 ofFigs. 2, 4 and 5.

Fig. 4 is a detail view mainly in transverse section on line 44 of Figs.1, 3 and 5.

Fig. 5 is a detail section on line. 55 of Figs. 3 and 4.

Referring to the drawings, 1 represents portions of the frame of amoving picture projecting machine having a horizontal way 2 thereinadapted to receive the supporting slide 3 of the lens box bracket 4.This lens Serial No. 414,939.

box bracket is mounted for adjustment in the slide for purposes wellunderstood.

The lens box bracket 1 is preferably cylindrical and is longitudinallysplit at 5 so that it may be clamped upon the cylindrical lens box 6which is rotatably adjustable within the bracket. The bracket isprovided with opposed cars '7 and 8 and a coacting clamp ing screw 9.The lens box is rotatively adjusted within the bracket by means of thescrew 10 which has threaded engagement with the split ears 11. The carsare provided with a screw 12 for clamping the screw 10 in its adjustedposition.

The screw 10 is provided with a flange or collar-like projection 13projecting through an openin 14 in the bracket to engage a slot 15 inthe lens box so that, by adjusting this screw 10, the lens box isaccurately adjusted and secured in its adjusted positions by a lockingscrew 12 clamping the bracket thereon.

Within the lens box are spaced lens holder supports 16 carrying pivots17 engaging the cars 18 on the lens holders 19. These lens holders aresegmental and disposed in side by side relation as clearly shown in Fig.4 with flattened sides adjacent. The lenses are shown at 20.

The ears 18 of the lens holders are arranged one on the inside and oneon the outside of the supports 16 so that the lens holder may beadjusted longitudinally relative to the lens box.

In the embodiment illustrated this is eifected by means of the screws 21which are carried by one pair of ears to coact with one of the supports,see Fig. 5. Coiled springs 22 are arranged on the pivots to engage theother pair of ears of the lens holders, acting to urge the lens holdersin the opposite direction. This provides for very accurate inclependentadjustment of the lens holders.

The lens holders are adjusted to and from each other by means of thescrew 23 having a tapered tip 24. This screw is carried by a segmentalblock 25 arranged within the lens box and projectin through slots 26 and27 in the lens box and lens box bracket, respectively.

Further lateral adjustment and support of the lens box is effected bymeans of the adjusting screw 28 carried by the lens holder andprojecting through a slot 29 in the bracket so that the screw engagesone of the lens holders. A coiled spring 30 is arranged opposite thescrew 28 to yieldingly support the other lens holder.

lVith this arrangement of parts very accurate adjustment of the lens ispossible to focus the same and to project pairs of foreground andbackground pictures in superimposed and proper registering relation.Inasmuch as these pairs of pictures are arranged in transverse side byside relation on the film, I provide a reversing prism 31 which ismounted in a barrel-like holder 3 having a flange 33 at its inner endwith segmental slots S-l therein engaged by the screws 35 so that theprism holder may be rotatively adjusted on the lens box bracket and theprojected picture properly positioned on the screen.

I have illustrated and described only such portions of a projectingmachine as seem necessary for the proper disclosure of my improvements.It will be understood that in use means are provided for feeding thefilm in timed relation to a shutter and suitable illuminating means.

While I have illustrated and described my improvements in detail in anembodiment especially designed for the projection of films such asillustrated and described in my said application, I desire to state thatmy present improvements may be readily adapted and are desirable for usein projecting other films or negatives, or modifications of the filmillustrated in my said application.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. In a projecting apparatus, the combination of a cylindricallongitudinally split lens box bracket, a cylindrical lens box mountedwithin said bracket for rotative adjustment and provided withlongitudinally spaced lens holder supports, a clamping screw for saidbracket, an adjusting screw for said lens box having a flange engagingsaid lens box through an opening provided therefor in said bracket, saidbracket being provided with a split ear with which said screw hasthreaded engagement, said ear being provided with a clamping screw, apair of segmental lens holders provided with pivot ears disposed inoverlapping relation to said supports, pivots arranged through said earsand said supports on said lens box, springs arranged on said pivots toengage one of said supports and one pair of said ears, adjusting screwson the other pair of ears coacting with one of said supports forlongitudinally adjusting said lens holders, an adjusting screw carriedby said lens box and provided with a tapered tip engaging between saidlens box holders opposite their said pivots, an adjust ing screw carriedby the lens box and engaging one of said holders, a spring on said lensbox engaging the other of said lens box holders opposite said screw, aprism, a tubular holder for said prism provided with a slotted flange atits rear end abutting the forward end of said bracket, and screws onsaid brack et engaging said slots whereby said prism holder is supportedfor rotative adjustment.

2. In a projecting apparatus, the combination of a cylindricallongitudinally split lens box bracket, a cylindrical lens box mountedwithin said bracket for rotative adjustment and provided withlongitudinally spaced lens holder supports, a clamping screw for saidbracket, an adjusting screw for said lens box having a flange engagingsaid lens box through an opening provided therefor in said bracket, saidbracket being provided with a split ear with which said screw hasthreaded engagement, said ear being provided with a clamping screw, apair of segmental lens holders provided with pivot ears disposed inoverlapping relation to said supports, pivots arranged through said earsand said supports on said lens box, springs arranged on said pivots toengage one of said supports and one pair of said ears, ad-

justmg screws on the other pair of ears coacting with one of saidsupports for longitudinally adjusting said lens holders, an adjustingscrew carried by said lens box and provided with a tapered tip engagingbei tween said lens box holders opposite their said pivots, an adjustingscrew carried by the lens box and engaging one of said holders, and aspring on said lens box engaging the other ofsaid lens box holdersopposite said screw.

3. In a projecting apparatus, the combination of a lens box bracket, alens box mounted Within said bracket for rotative adjustment andprovided with longitudinally spaced lens holder supports, a pair ofsegmental lens holders provided with pivot ears disposed in overlappingrelation to said supports, pivots arranged through said ears and saidsupports on said lens box, springs arranged on said pivots to engage oneof said supports and one pair of said ears, adjusting screws on theother pair of ears coacting with one of said supports for longitudinallyadjusting said lens holders, an adjusting screw carried by said lens boxand provided with a tapered tip engaging between said lens box holdersopposite their said pivots. an adjusting screw carried by the lens boxand engag ing one of said holders, a spring on said lens box engagingthe other of said lens box holders opposite said screw, a prism, atubular holder for said prism provided with a slotted flange at its rearend abutting the forward end of said bracket, and screws on said bracketengaging said slots whereby said prism holder is supported for rotativeadjustment.

4. In a projecting apparatus, the combination of a lens box bracket, alens box mounted within said bracket for rotative adjust ment andprovided with longitudinally spaced lens holder supports, a pair ofsegmental lens holders provided with plvot ears disposed in overlappingrelation to said supports, pivots arranged through said ears and saidsupports on said lens box, springs arranged on said pivots to engage oneof said supports and one pair of said ears, ad ust ng screws on theother pair of cars coacting with one of said supports for longitudinallyadjusting said lens holders, an ad usting screw carried by said lens boxand provided with a tapered tip engaging between said lens box holdersopposite their said pivots, an adjusting screw carried by the lens boxand engaging one of said holders, and a spring on said lens box engagingthe other of said lens box holders opposite said screw.

5. In a projecting apparatus, the comb1- nation of a lens box bracket, alens box mounted within said bracket for rotative adjustment andprovided with longitudinally spaced lens holder supports, a pair ofsegmental lens holders provided with pivot ears disposed in overlappingrelation to sald supports, pivots arranged through said ears and saidsupports on said lens box, springs arranged on said pivots to engage oneof sa1d supports and one pair of said ears, ad usting screws on theother pair of ears coactlng' with one of said supports forlongitudinally adjusting said lens holders, and an adjusting screwcarried by said lens box and provided with a tapered tip engagingbetween said lens box holders opposite their said pivots.

6. In a projecting apparatus, the combination of a lens box providedwith longitudinally spaced lens holder supports, a pair of segmentallens holders provided with plvot ears disposed in overlapping relationto said supports, pivots arranged through said ears and said supports onsaid lens box, springs arranged on said pivots to engage one of saidsupports and one pair of said ears, adjusting screws on the otherpair ofears coacting with one of said supports for longitudinally adjustingsaid lens holders, and an adjusting screw carried by said lens box andprovided with a tapered tip engaging between said lens box holdersopposite their said pivots.

7. In a projecting apparatus, the combination of a lens box bracket, alens box mounted in said bracket for rotative adjustment, a threadedmeans for effecting such rotative adjustment, lens holders mountedwithin said lens box for pivotal adjustment to and from each other andfor independent longitudinal adjustment, screws for independentlyadjusting said lens holders longitudinally of their pivots, an adjustingscrew disposed opposite said lens holder pivots and having a tapered tipcoacting with both of said lens holders, a spring supporting one of saidlens holders laterally, an adjusting screw engaging the other holder inopposed relation to said spring, a prism, and a holder for said prismmounted on said bracket for rotative adjustment.

8. In a projecting apparatus, the combination of a lens box mounted forrotative adjustment, a threaded means for effecting such rotativeadjustment, lens holders mounted within said lens box for pivotaladjustment to and from each other and for independent longitudinaladjustment, screws for independently adjusting said lens holderslongitudinally of their pivots, an adjusting screw disposed oppositesaid lens holder pivots and having a tapered tip coacting with both ofsaid lens holders, a spring supporting one of said lens holderslaterally, and an adjusting screw engaging the other holder in opposedrelation to said spring.

9. In a projecting apparatus, the combinations of a lens box bracket, alens box mounted in said bracket for rotative adjustment, a threadedmeans for efi'ecting such rotative adjustment, lens holders mountedWithin said lens box for pivotal adjustment to and from each other andfor independent longitudinal adjustment, screws for independentlyadjusting said lens holders longitudinally of their pivots, an adjustingscrew disposed opposite said lens holder pivots and having a tapered tipcoacting with both of said lens holders, a prism, and a holder for saidprism mounted on said bracket for rotative adjustment.

10. In a projecting apparatus, the combination of a lens box mounted forrotative adjustment, a threaded means for effecting such rotativeadjustment, lens holders mounted within said lens box for pivotaladjustment to and from each other and for independent longitudinaladjustment, screws for independently adjusting said lens holderslongitudinally of their pivots, and an adjusting screw disposed oppositesaid lens holder pivots and having a tapered tip coating with both ofsaid lens holders.

11. In a projecting apparatus, the combination of a lens box, lensholders mounted within said lens box for pivotal adjustment to and fromeach other and for independent longitudinal adjustment, screws for independently adjusting said lens holders longitudinally of their pivots, anadjusting screw disposed opposite said lens holder pivots and having atapered tip coacting with both of said lens holders, a spring supportingone of said lens holders laterally, and an adjusting screw engaging theother holder in opposed relation to said spring.

I 12. In a projecting apparatus, the combi nation of a lens box, lensholders mounted within said lens box for pivotal adjustment to and fromeach other and for independent longitudinal adjustment, screws forindependently adjusting said lens holders longi tudinally of theirpivots, and an adjusting screw disposed opposite said lens holder pivotsand having a tapered tip coacting With both of said lens holders.

13. In a projecting apparatus, the combination of a lens box, lensholders mounted within said lens box for pivotal adjustment to and fromeach other and for independent longitudinal adjustment, means for independently adjusting said lens holders longitudinally of their pivots,and an adjusting means disposed opposite said lens holder pivots andhaving a tapered tip coacting with both of said lens holders.

In witness whereof I have hereunto set my hand.

JAKOB BURKHARDT.

